Question

Explain the method of plotting the magnet field lines by using a small compass needle.

Answer 1

We will start drawing the magnetic field of lines from the north pole of the magnet. When a small compass is placed at a point near the north pole of the magnet, the needle turns around on its pivot and settle in the fixed direction. At other points away from the pole the needle settles tangent to the drawn field line. By plotting the directions indicated by the needle, we can draw a magnetic field of lines.